Discussion
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- Question
An SUS is
Options- A. exactly similar to SCR but with higher rating
- B. similar to UJT
- C. PUT and avalanche diode connected in anti parallel
- D. SCR and avalanche diode connected in parallel
- Correct Answer
- PUT and avalanche diode connected in anti parallel
- 1. Assertion (A): The output voltage of an inverter can be controlled by PWM technique
Reason (R): In a current source inverter the input current is constant.
Options- A. Both A and R are correct and R is correct explanation of A
- B. Both A and R correct but R is not correct explanation of A
- C. A is correct but R is wrong
- D. A is wrong but R is correct Discuss
- 2. A TRIAC is equivalent to
Options- A. two thyristors in series
- B. two thyristors in parallel
- C. one thyristor and one diode
- D. one thyristor and one transistor Discuss
- 3. A fully controlled bridge converter can operate in quadrants
Options- A. 1
- B. 1 and 2
- C. 1 and 3
- D. 1 and 4 Discuss
- 4. The advantage of modified series inverter with two inductors and two capacitors is
Options- A. the intermittent operation of battery is avoided
- B. efficiency of circuit is more
- C. the output frequency is low
- D. all of the above Discuss
- 5. The static equalisation circuit for thyristors connected in series is
Options- A. one resistor in series with each thyristor
- B. one resistor in parallel with each thyristor
- C. one resistor and one capacitor in parallel with each thyristor
- D. none of the above Discuss
- 6. In a half bridge inverter the gate pulses of the two thyristors have a phase displacement of
Options- A. 60°
- B. 90°
- C. 120°
- D. 180° Discuss
- 7. The cut in voltages for germanium and silicon diodes respectively as
Options- A. 0.3 V and 0.7 V
- B. 0.7 V and 0.3 V
- C. 0.6 V and 0.9 V
- D. 0.5 V and 0.7 V Discuss
- 8. The symbol in figure is for
Options- A. UJT
- B. PUT
- C. Shockley diode
- D. TRIAC Discuss
- 9. A cycloconverter is a group of controlled rectifiers.
Options- A. True
- B. False Discuss
- 10. In a certain inverter circuit each thyristor carries 26.67 A for 60°, 13.33 A for 120° and zero A for 180° of the cycle. The rms current of thyristor is
Options- A. 20 A
- B. 13.33 A
- C. 6.67 A
- D. 3.33 A Discuss
Power Electronics problems
Search Results
Correct Answer: Both A and R correct but R is not correct explanation of A
Correct Answer: two thyristors in parallel
Correct Answer: 1 and 4
Correct Answer: the intermittent operation of battery is avoided
Correct Answer: one resistor in parallel with each thyristor
Correct Answer: 180°
Correct Answer: 0.3 V and 0.7 V
Correct Answer: UJT
Correct Answer: True
Correct Answer: 13.33 A
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